Carburetor valve regulator



5 w "I513 i a W a 1 I w. y) m rilfi' April 21, 1953 i w. J. RALEIGH. 2,635,595

. CARBURETOR VALVE REGULATOR Filed May 19', 1950 2 SHEETS-SHEET 1 HTJWFF/VEK Ap 1953 I I w. J. RALEIGH 2,635,595

CARBURETOR VALVE REGULATOR Filed May 19, 1950 ZSHEETS-SHEET 2 WIN-Hid? HALE/6 H m %%4. %W

JTTJEWEW Patented Apr. 21, 1953 PATENT 1' OFFICE invent-ion relates-tea carburetor'wh-ich isused----with an internal-combustion engine and particularly to acarburetor used with an outboard motor. In such a carburetor there is a passage through which the combustible -mix-ture passes, -which passage has therein andis controlledb-ya plate-like-valve or what-is-known as a butterfly" valve. 'Magneto spark timing is varied by the motor operator by-moving the stator part of the magneto inhorizontal rotation about the verticalcrankshaftaxis. A cam is usually attached to this movable stator-which causes a follower element to rotate on a horizontal axis-ina vertical plane; the rotation of-the follower being transmitted by levers;pitmans gearspor cams to the carburetor throttle butterflyshaft. It is important to have a-certain' exact degree of throttleopeningat each'possible spark timing position 'inorder that the correct rate of, airflow exists through the carburetor-passages and'in combination with the spark timing results in-- the most satisfactory combustion conditions in: the engine cylinder. The present device accomplishes this by, eliminating deflections, backlash and otherobjectionswhich werepresent in- 2 the mounting of the older device.

It is an object of-this invention. to provide a simple and efficient mechanism for operating the above mentioned valve from: apart of the magneto, andone which will'givefthedesired movement, of said-valve and one-which can be adjustedwith practically micrometer precision to give said desired movement of the-valve.

- It isa further object of the invention to provide a carburetor having a plate-like or butterfly valve for regulating the flow of combustible mixture to the motor, a long shaft secured ,to said valve for oscillating the same and mounted in widely spaced hearings, to eliminate any play, an

arm extending radially from said shaft and hav 40 inga pin projecting therefrom spaced from said shaft 'thusforming a crank, together -with an oscillatable lever having a slot -in-which;said pinisdisposed so that whensaid lever is-swung said crank will beoscillatedand said valve rotated in the-desired manner.

It is another object of the inventionto provide a-carburetor having a passage with a plate-like valvemovable therein and adapted to open and close saidpassage, a-lever connected to said valve for oscillating the same, a-second lever; saidlevers "having juxtaposed portions between which "a resilient "member isdisposed --which transmits-movement from -said seccnd lever to saidflrst mentioned lever; togetherwith means .5

for changing the relative positions of i said levers in exceedinglysmall "amounts" .to secure. a fine adjustment. in the operation .of-said valve.

"It is still another object of the. invention .to provide a carburetor havinganoscillatable platelike'or butterflyvalve for regulatingthe flow of combustible mixture, a control for said valve comprising arr-actuating member and an actuated shaft-carrying said valve, the movement of said 0 actuating member varying the angular position posed, a second leverswingingabout the same axis as said first mentioned lever, said levers having juxtaposed portions, a compression coiled spring between said portions, a screw extending through said portions for determining their relative positions, said second lever being. arranged to be oscillated by a-cam carried: on the usual spark adjusting lever of the outboard motor.

These andother objects and advantages of'the invention: will be fully set; forth inthe' following description made in connection. with the accompanying drawings. .inpivvhich like: reference; characters refer to. similar-parts. throughout the several views-andinwhich:

Fig. 1: is, a: plan viewof. a-port-ion of; an outboardmotor and arbu t ra t c ed t retathe driveshaft of themotor being shown inhorizontal section;

Fig, 2 is a partial view in side elevation of some of the'parts shown vin Fig.- 1;

rlijig. 3-, is a, view, similar. to Fig. 2 showing. the parts in different position; f

isayiew in frontelevation of'the carburetor; and

Fig, 5 is a partial view similar to Fig.4 showing avalve in a different position. "Referring tothe drawings, a portion of an outboard motor is shown comprising a portion In of a casing, the drive shaft I] ,1 the spark ad-' justing iever--l2- which is oscillatable aboutthe axisofshaft I l'; togetherwitha carburetor l5.- Garburetor 'l 5--has-- a 'fiange- 15a 5 providedwith-a pair-of holes I 5b adaptedto-receive' attaching 51 bolts ifii-for securing itto a fiange lta' projech 'the head thereof.

ing from the casing l forming part of the cylinder block of the outboard motor. Carburetor l5 has a passage I50 extending from flange 15a inwardly through which the combustible mixture passes to the cylinders of the motor. Disposed in passage 150 is a plate-like valve 18. Valve I8 is secured to a shaft [9 which is journaled in the casing I5d of the carburetor. Shaft 19 has a portion 19a which is substantially of semi-cylindrical form, one-half of the shaft being cut away. Valve 18 is secured to the flat side of portion |9a by a headed screw 20. Valve I8 is shown as having a plurality of small holes [801. at one side, shown as the top side, and having a lower straight portion [8b forminga chord of the periphery of said valve. Shaft 19 projects at one end of casing IM and has a slot X9?) in said end in which is secured one end of a coiled torsion spring 2|, the other end of which is secured to a small headed screw 22 secured in casing [501. Spring 2| acts to rotate shaft [9 and to turn valve I 8 to the closed position shown in Fig. 5, said valve being stopped in said position by its upper end engaging the wall of passage He. Said valve has its verticaldiameter of slightly greater diameter than the passage so that the upper end of the valve engages the wall of passage 150 with valve l8 substantially in vertical position or at right angles to the axis of passage I50. The end of shaft 19 opposite spring 2| projects from casing I5d and has secured thereto an arm 24 which extends radially of shaft 19. While arm 24 could be secured in any suitable manner, in the embodiment of the invention illustrated it isshown as riveted tothe end of shaft l9. Arm

24 extends radially of shaft [9 and has secured therein a pin 25 projecting therefrom with its axis parallel to the axis of shaft i9. Pin 25 is disposed in an elongated preferably curved slot 26a in one arm of an angular lever 23 which is pivoted on a shaft 21 projecting from a boss [5e on casing 15d. Shaft 2'! is shown as having a reduced threaded end projecting at one end of boss [5e and equipped with a friction washer 28 and a nut 29.. tending parallel to shaft 21 and having spaced lugs 26b apertured to receive shaft 21. Lever 26 also has an upstanding plate-like portion 260 extending from portion 26a. Another lever 39 of plate-like form has a central portion 390. with portions extending at right angles .to each side of portion 30a, which latter portions are rounded at their lower ends and apertured to receive shaft 27. Lever 38 is thus oscillatable on shaft 21 on which lever 26 is oscillatable. The central plate-like portion 36a of lever 30 is spaced some distance from and is in horizontal alinement with portion 250 so that portions 260 and 30a are juxtaposed. A compression coiled spring 32 is disposed between portions 26 and 30a and engages said portions respectively at its ends. A headed screw 33 extends through portions 260 and through spring 32 and is threadedinto portion 30a. Screw 33 has a line and accurate thread and, is shown ashaving a washer 34 beneath Lever 30 extends upwardly and its upper end is in the plane of a cam 36 which is secured by screws 31 to the spark adjusting lever 12.

Carburetor l5 has other portions not connected with the present invention including a cylindrical member l5, which is moved longitudinally to engage a lever 31 to operate a choke valve. Member I5 canbe rotated to adjust the supply of Lever 26 has a portion 260 ex fuel. It is believed description of other parts of the carburetor is unnecessary.

In operation when the spark adjusting lever I2 is moved to the position it occupies when the motor is stopped, cam 36 moves so that spring 2| can swing valve [8 to the closed position shown in Fig. 5. This swings shaft [9 and crank arm 24 which in turn swings lever 26. Lever 2G in turn through spring 32 swings lever 30 to the position shown in Fig. 2. As the spark adjusting lever 12 is moved toward the starting position and is further moved in a counter-clockwise direction, as shown in Fig. 1, to increase the speed of the motor, cam 36 engages the upper portion of lever 39 and oscillates the same. In its extreme position lever 38 occupies the position shown in Fig. 3. Movement of lever 30 moves lever 26 through the spring 32. Movement of lever 26 as described, swings the crank arm 24 and moves valve 18 to its open position, as shown in Fig. 3. r The motion of the arm of lever 26 containing slot 25a and the action of said curved slot on pin 25 gives the desired movement to valve Hi. When the valve is first opening a certain movement of levers 26 and 38 gives a relatively small movement to valve l8. When the valve is nearly open wide a certain movement of levers 2B and 39 gives a greater movement to valve I8. The desired control of the fluid passing through passage I 50 is thus obtained. Lever 26 is as shown operated in one direction through spring 32. Spring 32 is preloaded or flexed and does not flex in the movement of levers 26 and 30. Turning of screw 33 changes the relative positions of portions 260 and 391). This gives a very easy and simple and at the same time a very fine and accurate adjustment. In previous structures two levers included in the operating mechanism for the valve were made as rigidly joined arms. To adjust the valve a connecting link which joined one of these arms was in eifect shortened and lengthened by a set screw arrangement. The set screw would make a hole in the shaft so that when it was attempted to set it at another place adjacent said hole it would tend to slip into the previously made hole. Such an adjustment was not satisfactorily positive or permanent. With the present structure the shaft I9 is quite long and mounted in spaced bearings which are comparatively widely spaced. Shaft 2'1 is also mounted in spaced bearings. This gives a rigid structure and minimizes the effects of bearing play. A great improvement is obtained in the initial setting or pick-up position of the motor by the screw and spring adjustment means. stated, the screw gives a substantial micrometer control in making said initial setting. Formerly this setting was made by the use of a set screw as above described. The shape of the slot 2612.

can be varied as required by the particular motor to give the desired movement to the valve shaft.

From the above description it will be seen that I have provided a simple and efiicient construction for operating the valve 18. Not only is the movement of the valve made as desired but adjustment of the operating mechanism is' very simple. The structure constitutes a great advance over the prior art. The novel structure has been amply demonstrated in actual practice, found to be verysuccessful and efficient and is being commercially made.

It will of course be understood that various changes may be made in the form, details, arrangement and proportions of theparts, without departing from thescope of applicants invention, which generally stated, consists in a device capable of carrying out the objects above set forth, in the parts and combinations of parts disclosed and defined in the appended claims.

What is claimed is:

1. A carburetor structurehaving in combination, a casing, a passage in said casing, a valve for opening and closing said passage, a member journaled in said casing to-which said valve is connected, a lever for oscillating said member and valve, a second lever, said levers having juxtaposed spaced portions, a resilient means between said portions acting to move them apart, means connecting said levers constructed and arranged to change their relative positions by very small increments, and means for oscillating said second lever whereby a very fine control of said valve is obtained.

2. A carburetor structure having in combination, a casing, a passage in said casing, a valve for opening and closing said passage, a member journaled in said casing to which said valve is connected, a lever connected to said member and oscillatable about an axis for oscillating said lever and valve, 9, second lever oscillatable about said axis, said levers having juxtaposed portions, a compression coiled spring between said portions, a screw for varying the distance between said portions, and means for oscillating said second lever.

3. A carburetor structure having in combination, a, casing, a, passage in said casing, a platelike valve for opening and closing said passage, a member journaled in said casing to which said valve is connected, an arm secured to said member and extending radially therefrom, a pin carried by said arm and spaced from said member, a lever having angularly diverging arms, one of said arms having a slot extending longitudinally thereof in which said pin is disposed, said lever being pivoted adjacent the end of its other arm, a second lever having a portion adjacent said first mentioned lever at the side of the pivot of the latter remote from said slot, means for varying the relative positions of said levers, and means for oscillating said second lever.

4. An outboard motor structure having in combination, a carburetor having a passage therein, a valve for opening and closing said passage, means connected to said valve for oscillating the same including a crank pin, a lever having an elongated slot therein in which said pin is disposed, a second lever, a member between said levers through which motion is transmitted to said first mentioned lever by said second lever, a spark adjusting lever, and a cam carried by said spark adjusting lever for operating said second lever.

5. The structure set forth in claim 4, and

means for varying the relative positions of said first mentioned and second levers by very.-small amounts whereby a fine regulation of said valve is had.

6. A carburetor structure having in combination, a casing, a passage in said casing, a platelike valve for opening and closing said passage, a member journaled in said casing to which said valve is connected, a lever for oscillating said member and valve, a second lever, said levers having spaced juxtaposed portions, means engaging said portions including a resilient means between and engaging said portions for varying the distance between said first mentioned and second levers, a spark adjusting lever, and means on said spark adjusting lever for engaging said second lever for oscillating the same.

7. The structure set forth in claim 6, said first mentioned means comprising a fine thread screw whereby a very accurate positioning of said valve is obtained.

8. In an outboard motor having a spark adjusting lever, a carburetor having a passage therein for a combustible mixture, a valve movable for regulating said passage, means operated by said spark adjusting lever for moving said valve comprising connected oscillating members having spaced juxtaposed portions, and a screw having fine threads for a substantial micrometer adjustment of said portions to vary the relative positions of said members.

9. In an outboard motor having a spark adjusting lever, a carburetor having a passage therein for a combustible mixture, a valve movable for regulating said passage, a shaft to which said valve is secured, spaced bearings in which said shaft is journaled, a lever for oscillating said shaft to change the position of said valve, a second lever for transmitting motion to said first mentioned lever, said lever having spaced juxtaposed portions and a resilient means between and engaging such portions for varying the relative positions of said levers by very small amounts, and means for actuating said second lever from said spark adjusting lever.

WALTER J. RALEIGH.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 913,121 Frayer Feb. 23, 1909 956,882 Bright May 3, 1910 1,001,352 Chadwick Aug. 22, 1911 1,014,328 Podlesak Jan. 9, 1912 1,895,328 Howe Jan. 24, 1933 2,069,315 Irgens Feb. 2, 1937 2,087,669 Johnson et al. July 20, 1937 2,430,806 De Marco Nov. 11, 1947 2,455,775 Johnston et a1. Dec. 7, 1948 

